Arronax is a plugin for Nautilus (the GNOME default file manager) to create and modify application starters (".desktop files"). It adds the menu item "Create starter for this file" to the context menu (the menu you get when you right-click a file in the file manager). If the file is an application starter, you get the item “Modify this starter” instead. If you have icons enabled on your desktop, Arronax adds the menu item “Create starter” to your desktop’s context menu.

nautilus-audio-convert is an extension of Gnome
Nautilus that provides a user-friendly way to
convert several audio files. This extension adds a
popup-menu item that applies to every audio file
selected with the file manager. The supported
formats are Ogg Vorbis (ogg), MPEG3 (mp3), MS-PCM
Waves (wav), and MS-Audio Streaming File (asf).

Masna provides a simple graphical interface (GUI) to manage Nautilus scripts. For scripts that are part of the system-wide Nautilus script collection (by default /usr/share/nautilus-scripts; you can change this in the settings dialog of Masna), it manages symlinks in the user’s Nautilus script folder. For scripts in the user’s Nautilus script folder, it manages the file permissions.